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Enzymatically active forms of reverse transcriptase of the human immunodeficiency virus
F Lori1, A I Scovassi, D Zella
1Instituto di Genetica Biochimica ed Evoluzionistica del CNR, Pavia, Italy.
AIDS Research and Human Retroviruses
|October 1, 1988
Summary
Both the 66 kD and 51 kD reverse transcriptase proteins from HIV-1 are independently active. A larger 165 kD form, possibly the gag-pol precursor, also shows enzymatic activity.
Area of Science:
- Virology
- Molecular Biology
- Biochemistry
Background:
- Human Immunodeficiency Virus type 1 (HIV-1) reverse transcriptase is a key enzyme in viral replication.
- The enzyme exists as a complex of two subunits, p66 and p51, which are highly immunogenic.
- Understanding the enzymatic activity of individual subunits and potential precursors is crucial.
Purpose of the Study:
- To investigate the enzymatic activity of the individual p66 and p51 subunits of HIV-1 reverse transcriptase.
- To identify and characterize other enzymatically active forms of reverse transcriptase in HIV-1.
- To determine the activity of the putative gag-pol precursor.
Main Methods:
- Utilized an activity gel electrophoresis (PAGE) procedure under denaturing conditions.
- Analyzed highly purified preparations of HIV-1.
- Visualized enzymatic activity in situ after gel separation.
Main Results:
- Identified two major active bands corresponding to 66 kD and 51 kD reverse transcriptase polypeptides.
- Confirmed that both p66 and p51 are independently enzymatically active.
- Detected an additional active band at 165 kD, potentially representing the gag-pol precursor, contributing 2-4% of total activity.
Conclusions:
- The two major forms of HIV-1 reverse transcriptase, p66 and p51, are independently enzymatically active.
- A higher molecular weight form (165 kD) associated with the gag-pol precursor also exhibits enzymatic activity.
- These findings clarify the enzymatic nature of HIV-1 reverse transcriptase components.